Mock Extension Talk

HRT298 Spring 2015

Transcript

1. Can neighboring cattle feedlots make baby green babies a food-safety risk? Gitanshu Munjal
2. Extension Talk
3. Photo by Eric Erbe, digital colorization by Christopher Pooley, USDA, ARS, EMU. Source: http://emu.arsusda.gov
4. Escherichia coli • Rod-shaped, Gram negative bacteria • Intestinal heroes • O157:H7 (STEC) and pathotypes • Transmission • Symptoms • Detection/Quantification
5. Creative Commons picture by Eric Hamiter https://www.flickr.com/photos/ehamiter/4357020857/
6. Why leafy greens? • Consumption habits • Data from Center for Disease Control and Prevention (Erickson & Doyle, 2012) • Meta-analysis of produce associated outbreaks in the US (Anderson et al., 2011) • Past food-borne outbreaks associated with Shiga toxin producing E. coli (Gould et al., 2013) • Sources?
7. Creative Commons picture by NDSU Ag Communication https://www.flickr.com/photos/49873984@N03/5424277440/
8. Feedlots and O157:H7 • Cattle = reservoirs of O157:H7 (Berry & Wells, 2010) • Pathogen reservoir = food-safety risk? - How likely is transport? Emission rate? • Interim distance between feedlots and produce? - (Millner & Suslow, 2008; Yanamala et al., 2011)
9. Figure 1 from Berry et. al, 2014
10. Findings • Total E. coli recovered from all sampling distances • High O157:H7 detected in FSM (0m; source) samples • Poor correlation with time • Effects of rainfall, temperature, and cattle activity • Air samples… pest flies? • Caveats? greens and baselines Year % of O157:H7 positive FSM % of O157:H7 positive Leafy Greens 60m 120m 180m 2011 73.3 1.5A 0.4A 0.8A 2012 71.7 5.6A 4.0AB 2.8B Both Years 72.5 3.5A 2.2AB 1.8B Data from Berry et al., 2015
11. So what? Can neighboring cattle feedlots make baby green babies a food-safety risk? Yes! Current required distance (120m) likely not sufficient
12. References • Erickson, Marilyn C., and Michael P. Doyle. "Plant food safety issues: linking production agriculture with One Health." (2012). • Anderson, Maren, et al. "Pathogen-produce pair attribution risk ranking tool to prioritize fresh produce commodity and pathogen combinations for further evaluation (P 3 ARRT)." Food Control 22.12 (2011): 1865-1872. • Gould, L. Hannah, et al. "Surveillance for foodborne disease outbreaks—United States, 1998– 2008." MMWR Surveill Summ 62.2 (2013): 1-34. • Berry, Elaine D., and James E. Wells. "Escherichia coli O157: H7: recent advances in research on occurrence, transmission, and control in cattle and the production environment." Advances in food and nutrition research 60 (2010): 67-117. • Yanamala, S., et al. "Potential for microbial contamination of spinach through feedyard air/dust growing in close proximity to cattle feedyard operations."Journal of Food Safety 31.4 (2011): 525-529. • http://calgreens.org/control/uploads/Millner_and_Suslow_- _Concentration_and_deposition_of_viable_E._coli_in_airborne_particulates_from_composting_and_li vestock_operations_.pdf
13. “In our obscurity, in all this vastness, there is no hint that help will come from elsewhere to save us from ourselves…To me, it underscores our responsibility to deal more kindly with one another, and to preserve and cherish the pale blue dot, the only home we've ever known.” - Carl Sagan, Pale Blue Dot, 1994 Image credit: NASA/JPL-Caltech/Space Science Institute